Reduced physics well production monitoring

Abstract

Fluid flow dynamics modeling methods and system are provided. In some embodiments, such methods include determining a bottomhole pressure for the unconventional reservoir based, at least in part, on a tubing head pressure for one or more wells penetrating at least a portion of the unconventional reservoir, one or more fluid properties of a fluid in the unconventional reservoir, and a well production volume for the one or more wells; determining a Productivity Index (PI) for the unconventional reservoir, based, at least in part, on the one or more fluid properties and measured well data for the one or more wells, wherein the measured well data includes a well production rate and a well flowing pressure; and determining a fluid depletion of the unconventional reservoir based, at least in part, on the bottomhole pressure and the PI.

What is claimed is: 
     
       1. A method of modeling fluid depletion from an unconventional reservoir, comprising:
 measuring, via two or more gauges, a tubing head pressure of two or more wells penetrating at least a portion of the unconventional reservoir; 
 for the two or more wells, determining a bottomhole pressure for the unconventional reservoir based on the tubing head pressure of the two or more wells, one or more fluid properties of a fluid in the unconventional reservoir, and a well production volume for the two or more wells; 
 for the two or more wells, determining a drainage volume and a reservoir pressure depletion based, at least in part, on the bottomhole pressure for the unconventional reservoir; 
 for the two or more wells, determining, using an optimization routine, a transient well performance for the unconventional reservoir based, at least in part, on the drainage volume and the reservoir pressure depletion; 
 determining a Productivity Index (PI) for the unconventional reservoir, based, at least in part, on the transient well performance, the one or more fluid properties and measured well data for the two or more wells, wherein the measured well data comprises one or more of a well production rate and a well flowing pressure; and 
 identifying at least one well of the two or more wells experiencing production interference from another well based, at least in part, on the PI. 
 
     
     
       2. The method of  claim 1 , further comprising estimating the one or more fluid properties of the fluid based, at least in part, on a PVT model or correlation. 
     
     
       3. The method of  claim 1 , wherein determining the fluid depletion comprises determining natural gas depletion of the unconventional reservoir. 
     
     
       4. The method of  claim 1 , further comprising determining an instantaneous recovery ratio for the two or more wells. 
     
     
       5. A method of modeling fluid depletion from an unconventional reservoir, comprising:
 measuring, via two or more gauges, a tubing head pressure of two or more wells penetrating at least a portion of the unconventional reservoir; 
 for the two or more wells, determining a bottomhole pressure for the unconventional reservoir based on the tubing head pressure of the two or more wells, one or more fluid properties of a fluid in the unconventional reservoir, and a well production volume for the two or more wells; 
 for the two or more wells, determining a drainage volume and a reservoir pressure depletion based, at least in part, on the bottomhole pressure for the unconventional reservoir; 
 for the two or more wells, determining, using an optimization routine, a transient well performance for the unconventional reservoir based, at least in part, on the drainage volume and reservoir pressure depletion; 
 determining a Productivity Index (PI) for the unconventional reservoir, based, at least in part, on the transient well performance for the two or more wells; and 
 determining whether to develop a field comprising the unconventional reservoir based, at least in part, on the PI and the bottomhole pressure. 
 
     
     
       6. The method of  claim 5 , further comprising selecting one or more parameters or properties of a field development operation based, at least in part, on the PI and the bottomhole pressure.